and just with a StormR Sivir doesn't clear a whole wave with one aa, if you think that you dont play Sivir I guess.
You do realise her W allows her basic attack projectile to hit every unit next to each other 3 TIMES, each time, each projectile being able to CRIT.
Anyway she's balanced, dunno why anyone would complain about her.
I wasn't saying she's broken, i'm just saying how this item is getting rid of champions weaknesses, jhin's was that he's immobile, graves is that he required to scale and invest gold to buy Critical Strike for bonus damage to his Passive, Sivir's was that she needed Mana Sustain since she needed to use abilities to clear waves (since not a lot of people would buy Statikk Shiv as a first item on Sivir).
He seems quite strong for soloQ and he has even been played on pro play, he should get a nerf, not the item.
True enough, he is strong without the item, but this item still just adds on to the problem.
What a surprise that Kog'Maw, Ashe, Varus are the most team dependent adcs in the game, all of them wiht 0 mobility and that for some reason they tend to have lower winrate on soloQ (even thogh KogMaw doesn't even have low winrate), who could guess why does it happen.
I will make a quick note about Kog, the reason why his winrate isn't bad is because he recently received a decent buff.
Anyway, so they should be kept entirely useless on their own just because they didn't get a team who can't communicate well with each other for example? That is a massive downside to picking them don't you think? Not to mention the amount of Counters that come for each of them.
.
is countered by...
(since most of his damage is magic and his constant damage is from his W)
(blocks 12% of his damage on his W)
.
is countered by...
(highly underrated, reduces 25% of her Passive Slow, while not enough it still helps)
(blocks 12% of the damage from each of her Flurry on her Q)
.

Pretty much any Defensive Item counters him, due to really bad base numbers on his Abilities (without Items he is useless), detonating Blight stacks has no noticeable effect when you don't have enough Attack Speed to apply 3 stacks for each ability, not to mention the fact that it requires you to stand still there for a long time to do this, you could try to orb-walk or kite to apply the Blight Stacks but you won't have enough Movement Speed nor the ideal amount of Attack Range to apply the Blight Stacks without putting yourself in immediate danger all the time.
And yet you have champs like Lucian, Twicht or MF not buying StormR in the vast majority of their games and having great winrates on soloQ, even Vayne has a decent winrate with BotrK with also a great pickrate.
Maybe because they have their own go to items that are perfect for them?
Lucian
has Bork because his Passive for whatever reason synergises well with that item, in combination with Black Cleaver.
Twitch
benefits from Bork's general stats, even if they are low. It's active allows him to chase his opponent better, and it allows him to apply Bork's Passive damage from a long distance safely to multiple units.
Miss Fortune
for a long while hasn't stopped buying Lethality and Armor Penetration because her ult alone shed's everyone in teamfights as well as her Q + Dark Harvest chips off a lot of someone's health in laning phase.
Vayne
while not in the worst or best place, a good player can make her work. She's back to the on-hit playstyle because Crit doesn't really benefit her as well as it used to for obvious reasons.
overall they did a good job forcing crit adcs to buy a item that doesn't scale into lategame
Is there even a lategame anymore? Every game is still pretty much decided on which team wins, and once that team gets ahead it's impossible to make a comeback unless they hardcore throw.